Earlier this month, Mubarak, 84, suffered a head injury and bruising when he slipped in a prison hospital bathroom, CNN reported.
Egypt's state prosecutor ordered Mubarak's transfer to a military hospital, although an update of Mubarak's health wasn't given.
Mubarak is serving a life-in-prison sentence in Cairo's Tora prison for his complacency in the killing of protesters during Egypt's 2011 revolution.
He has been suffering health problems since his trial, which he attended on a gurney. He was reportedly in a coma in June following his conviction on charges of corruption and the killing of the protesters.